Swimmers are being kept out of the water at Coney Island and nearby Manhattan Beach because of concerns about a sewage overflow.

The New York City Parks Department posted signs Sunday saying swimming wasn't permitted at the two Brooklyn beaches. But the Coney Island boardwalk remains open, and sunbathing on the sand was allowed.

The city Department of Environmental Protection says ocean water at the two beaches may be contaminated by raw sewage from a sewage treatment plant that overflowed.

Other city beaches were open for swimming.

Meanwhile, Nassau County officials reopened 22 beaches Sunday. The beaches had been closed over worries about stormwater runoff.